When I'm doing CSV export located at: /admin/orders?selectedView=all I have column called "Lineitem compare at price"
it's described here (https://help.shopify.com/en/manual/orders/export-orders) as
|The compare at price of the line item.|
How to get this value from Admin REST API?
You would use the compare_at_price from the REST API (variant): https://shopify.dev/docs/admin-api/rest/reference/products/product-variant?api[version]=2020-04